This 3-head assembly line linear scale adopts an all-stainless steel sealed body, which is anti-corrosion and dust-proof; the parts in contact with the material (storage hopper, lower hopper, vibrating plate, weighing hopper, etc.) can be quickly disassembled, and cleaning is particularly convenient. In addition, the automatic linear scale can be used with various packaging machines and filling machines, and can be used for semi-automatic packaging.